status signaling-group
Issue 4 May 2002
8-383555-233-123
Field descriptions
Group
ID
Numerical ID of the signaling group (1-8)
Type
facility associated signaling
: all members are on a
single DS-1 facility. Facility associated signaling groups support only the
simplex D-channel configuration.
non-facility associated signaling: members can be
carried by multiple DS-1 facilities.
The DS-1 facility is identified across the ISDN-PRI using an explicit
facility identifier. In a simplex configuration one D-channel is used to
signal for B-channel members, while in a duplex configuration two
D-channels are used to signal for B-channel members (one channel is
active and the other is used as a backup to the active channel).
Group
State
in-service
: one of the D-channels signaling for the group is in
service
out-of-service: neither D-channel in the group is in service
NOTE:
If there is no D-channel backup and the primary D-channel
is out-of-service, then the signaling group is in an
out-of-service state.
Link
Link transporting the D-channel
Port
Address of the port transporting either the primary or secondary
D-channel
Level 3
State
State of the primary or secondary D-channels:
in-service: a D-channel is “in-service” when it is in the
multiple-frame-established state at layer 2 carrying normal call-control
signaling at layer 3.
standby: a D-channel is “standby” when it is in the
multiple-frame-established state at layer 2, and not carrying any layer 3
call-control messages on logical link 0,0.
wait: a D-channel is in a “wait” state when an attempt has been made
by one side of the interface to establish layer 3 peer communications as
part of the process of going to the “in-service” state, which is transitional
in nature. Only when the
ISDN SERVICE message is sent over the
interface, and the far end of the interface responds with a SERVICE
ACKnowledge message is the D-channel placed in the “in-service” state.
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